Growing Broccoli

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02 May 21 mary Olenick (Canada - Zone 5b Temperate Warm Summer climate)
I tried to grow broccoli once in garden boxes. they grew very tall and spindly but the heads didn't amount to much. What am I doing wrong?
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04 May 21 (New Zealand - temperate climate)
They were probably too crowded together and not enough light. Broccoli need about 25 - 30 cm square each as a minimum.
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